Control measures of wheat scab

Wheat scab, also known as wheat ear withered, rotten wheat head, red wheat head, can cause seedling withered, ear rot, stem base rot and stalk rot, from seedlings to adult plants can suffer, the most serious is ear rot. So what are the symptoms of scab attack? How to prevent it? Let's get to know each other.

I. Symptoms

1, seedling dry

It is caused by the infection of germs in seeds, soil or sick bodies. First, the buds turn brown, then the root cap decays, causing the seedlings to be yellow and wet in light cases, death in heavy cases, and pink mold in dead seedlings when humidity is relatively high.

2. Ear rot

When wheat blossoms, water-soaked brown spots are produced on the ears and gradually spread to the whole ear, resulting in yellow spikelets. Pink colloidal mold layers are produced when humidity is high. In the later stage, there will be small blue-black particles in the area, which can not be erased when touched by hand, and will also extend to the ear axis, so that the ears above the disease form withered white ears.

3. Root rot

The disease can occur only when the seedlings are mature, and the base of the stem will turn brown and rot until the whole plant dies.

4. Stem rot

Generally occurs in 1-2 nodes under the ear, early in the leaf sheath appears water-like chlorotic spots, or gradually expanded into light brown or reddish brown irregular spots, serious disease, will cause the disease part above the yellow, sometimes can not timely heading or pull out yellow ears, in the wet disease part appears pink mold layer.

II. Prevention and control measures

1. Select varieties with strong disease resistance

Although there are no immune varieties at present, there are some disease-resistant varieties, and growers can choose locally suitable varieties according to local conditions.

2. Agricultural control

Reasonable irrigation and drainage should be carried out. Wetlands should be ditched and drained. After harvest, fields should be cleaned in time to reduce bacteria source, timely sowing should be carried out to avoid rain in flowering period, rational fertilization should be promoted, compost made by enzyme bacteria should be promoted, formula fertilization technology should be adopted, and partial application of nitrogen fertilizer should be avoided to improve plant disease resistance.

3. Chemical control

Seed dressing with pesticide before sowing, spraying carbendazim or metalaxyl every 5-7 times in flowering stage, or spraying chlorpyrifos, pirimicarb, pirimicarb and potassium dihydrogen phosphate solution in late stage, the control effect is better.

The above is the introduction of wheat scab control measures, I hope to help you, want to know more about the relevant knowledge, please pay attention to us.